Fujifilm XQ1 has a
12.0MP 2/3-inch (8.8 x 6.6 mm ) sized CMOS X-TRANS II sensor . On the other hand, Nikon S220 has a
10.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor .
Below you can see the XQ1 and S220 sensor size comparison.
As seen above, Fujifilm XQ1 has a 2.1x Larger sensor area than Nikon S220. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.